Fix Throttler initialization. #10154
Merged
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Ensure that the Throttler last allowed time is zero-initialized. This field was uninitialized on macOS with clang 14, causing test failures.
Since we are here, we also switch the Throttler to use the chrono steady_clock (since we don't want it to jump during a throttle interval), and remove virtual functino annotations, since Throttler can't reasonably serve as a base clase.